Is there an option, like on lights sources, to tell the object that has an emission shader to not cast shadows in the scene?
Simply go to the object panel on the right, scroll down to the Ray Visibility panel, and uncheck "Shadow". Note that this will apply to the entire object, not just the material.
Add a transparency Node to a mix shader.
I have the following nodes:
Geometry, Emission, Transparent BSDF, Mix Shader, and Material Output.
The Geometry node makes the emitter one sided by connecting "Backface to Mix Shader/ Fac" (the grey input).
Transparent and Emissions also input the the Mix Shader/ (shader inputs the green ones)
Then the shader connects to the Material output.
Don't use the Mix Shader, use the Add Shader.